[Cottonwoods and Poplars East of the Cascade Mountains of Oregon and Washington]
Plains Cottonwood

Populus deltoides ssp. monilifera

Synonym: Populus deltoides var. occidentalis

Dorsal leaf surface of Plains Cottonwood: Populus deltoides ssp. monilifera (Synonym: Populus deltoides var. occidentalis) --- Ventral leaf surface of Plains Cottonwood: Populus deltoides ssp. monilifera (Synonym: Populus deltoides var. occidentalis)

Close-ups of the dorsal (left) and ventral (right) leaf surfaces of plains cottonwood as seen high on the eastern slopes of Steptoe Butte in eastern Washington........................June 22, 2009.
Paul Slichter